Dental swage.



No. 802,683. PATENTED 00T., 24, 1905. L R. COMINS.

DENTAL SWAGE.

APPLIOATION FILED JAN. 2z. 1904.

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TTNTTFD STATES JOHN R.

-DENTAL No. 802,683. Specication of Application tiled January 22 To all wiz/om t may concern:

Be itknown that I, JOHN R. OoMINs, of Syracuse, in the county of Onondaga, in the State of New York', have invented new and useful improvements in Dental Swages, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the species of dental swages in which the matrix is embedded in plastic moldine interposed between the male and female members of the swage.

The object of the invention is to provide a swaging-tool which shall be very simple and inexpensive to vmanufacture and very convenient, eiiicient, and durable in its use, and adapted to be operated while carried in the hand of the operator, and to that end the invention consists in the improved construction of the component parts of the swaging-tool hereinafter described, and summed up in the claim.

In the annexed drawings, Figure 1 is a side view of a dental swage embodying' my invention. Fig. 2 is a top plan view of the same. Fig. 3 is a vertical transverse section showing the tool in position preparatory to the swaging operation. Fig. 4 is a vertical section showing the tool in its position at the completion of the ,swaging operation. Fig. 5 is a perspective view of the matrix, and Fig. 6 is an enlarged vertical transverse section of vthe matrix equipped with the gold-leaf and paper wrapper.

My improved dental swage is composed of only two metallic members, a and b, each of which is formed in one piece. The member a constitutes the base of the swage and consists of an integral block which is formed with a cylindrical socket c, extending1 from the top of the block part way toward the bottom thereof and terminating in a semispherical depression (Z, wholly within the block, and thus permanently closing the lower end of said socket. The second member b constitutes the plunger, which is of the same diameter as the socket o into which it is inserted. The inner end of this plunger is formed with a semispherical recess f of the same diameter as the plunger. A shoulder e on the exterior of the plunger, coming in contact with the top of the block a, serves to limit the inward movement of the plunger to prevent it being forced into the PATENT OFFTOT COMINS, OF SYRAOUSE, NEW YORK, ASSIGNOR TO FREDERlOK H. COLE, OF SYRAOUSE, .NEV YORK.

SWAGE.

Patented Oct. 24, 1905.

socket c. vf and j represent separate cohesive plastic packings preferably composed of pipeclay and glycerin. The packingy is deposited in and efliectually fills the depression (l, in which it is retained by adhesion, while the packing j is placed and likewise retained in the recess f. Z represents the matrix upon which the gold crown is to be formed. Said matrix projects from a base-plate w, which is preferably formed integral with the matrix.

In the operation of swaging the gold crown on the matrix the gold-leaf W is placed on the matrix and covered by thin pliable paper o, which is tied around the base of the matrix, as indicated at o in Fig. (5. The matrix thus equipped is introduced in an inverted position into the top of the packing and then the plunger 7) is inserted in the socket o and driven in with su iiicient force to cause the packing ,7' to press on the base-plate a of the matrix and onto the packing f/, so as to cause the packing to effectually press the gold-leaf onto every part of the matrix and form a perfect gold crown thereon. The paper wrapper o prevents the packing from entering between the matrix and the gold'crown.

The swage member a may be provided with ventiducts t for escape of air that may be entrapped in the member a during the swaging operation. After the swaging operation is completed the plunger is withdrawn and the matrix, with the gold crown formed thereon, is removed from the packing '21, which remains in the tool and is-not handled. The packing' is thus protected from becoming dry and hard or soiled and the tool is always ready for use.

What I claim as my invention is- The improved dental swage consisting of an integral base-block formed with a cylindrical socket extending from the top of the block part way toward the bottom thereof and termin ating in a semispherical depression wholly within the block, the plunger formed at its inner end with a semispherical recess of the same diameter, and separate cohesive plastic packings retained by adhesion in the aforesaid socket and recess substantially as described and shown.

JOHN 1t. OOMlNS.

Vitnesses:

ELIZABETH LANE, J. J. LAAss.

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